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Comparison of District Heating Systems and Distributed Geothermal Network for Optimal Exergetic Performance

Falk, P.M. and Meggers, F. and Stephan, Peter and Dammel, Frank (2016):
Comparison of District Heating Systems and Distributed Geothermal Network for Optimal Exergetic Performance.
In: Expanding Boundaries: Systems Thinking for the Built Environment, In: Sustainable Built Environment (SBE) Regional Conference, [Online-Edition: http://vdf.ch/expanding-boundaries.html],
[Conference or Workshop Item]

Abstract

As part of the IEA ECB Annex 64, Low Exergy Communities, we investigate distributed heating and cooling systems using large campus infrastructures as baselines. The Princeton University system serves as a baseline with a 15 MW combined heat and power facility that supplies heating in winter and cooling in summer. This paper as- sesses a low temperature hot water combined heat and power system and a geothermal system as two alternatives to the current system. The heating period of 2013/2014 is investigated. To assess the primary energy and exergy input required to meet the campus heating demand of 132.8 GWh, the existing system and a theoretical geothermal system are modelled using the MATLAB/Simulink based toolbox CARNOT. The combined heat and power system needs 338.1 GWh of exergy to meet the heat demand and to produce 63.1 GWh of electricity. The geothermal system only needs 219.6 GWh of exergy to meet the heating demand and to provide the same amount of electricity using the electricity grid. The energy efficiency of both investigated systems is equal, but one third of the geothermal system’s energy input is renewable geothermal heat. Also, the exergy efficiency of the geothermal system is 30.7 %, whereas the combined heat and power system has an exergy efficiency of only 19.9 %.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Falk, P.M. and Meggers, F. and Stephan, Peter and Dammel, Frank
Title: Comparison of District Heating Systems and Distributed Geothermal Network for Optimal Exergetic Performance
Language: English
Abstract:

As part of the IEA ECB Annex 64, Low Exergy Communities, we investigate distributed heating and cooling systems using large campus infrastructures as baselines. The Princeton University system serves as a baseline with a 15 MW combined heat and power facility that supplies heating in winter and cooling in summer. This paper as- sesses a low temperature hot water combined heat and power system and a geothermal system as two alternatives to the current system. The heating period of 2013/2014 is investigated. To assess the primary energy and exergy input required to meet the campus heating demand of 132.8 GWh, the existing system and a theoretical geothermal system are modelled using the MATLAB/Simulink based toolbox CARNOT. The combined heat and power system needs 338.1 GWh of exergy to meet the heat demand and to produce 63.1 GWh of electricity. The geothermal system only needs 219.6 GWh of exergy to meet the heating demand and to provide the same amount of electricity using the electricity grid. The energy efficiency of both investigated systems is equal, but one third of the geothermal system’s energy input is renewable geothermal heat. Also, the exergy efficiency of the geothermal system is 30.7 %, whereas the combined heat and power system has an exergy efficiency of only 19.9 %.

Title of Book: Expanding Boundaries: Systems Thinking for the Built Environment
Divisions: 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative > Clusters of Excellence
16 Department of Mechanical Engineering
Exzellenzinitiative
Profile Areas > Thermo-Fluids & Interfaces
Profile Areas
Event Title: Sustainable Built Environment (SBE) Regional Conference
Date Deposited: 26 Aug 2016 09:19
Official URL: http://vdf.ch/expanding-boundaries.html
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